Steam-boiler system



J. J. MILDON.

' STEAM BOILER SYSTEM. APPLICATION FILED NOV: 20. 1918.

l/VVE/VTOR g By lg/400M W ATTORNEYS- 1.1. MILDON.

STEAM BOILER SYSTEM.

APPLICATION YHLED NOV. 20. 1918.

1,402,430. Patented Jan. 3, 1922.

3 SHEETS-SHEET, 2.

I l I I I l A TTOR/VE Y J. J. MILDON..

STEAM BOILER SYSTEM.

APPLICATION FILED NOV. 20|1918.

Patented Jan. 3, 1922.

3 SHEETS-SHEET 3.

JT/J/AMA/ A TTOHIVEYS it? ll i an stares JAMES J. MILIDON, OF BROOKLYN, NE! YORK.-

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Specification of Letters Patent.

Patented Jan. 3, 1322.

Application filed November '20, 191 8. Serial-No. 263,310.

York, have invented certain new and useful Improvements ini-Steam-Boiler Systems, of which the following is a faith-clear, and exact description. 7, f

My invention relatessto: improvements in steam boiler systems and-has for' itsJObj'e'ct to provide. a system which can be installed by making: additions to an ordinary horizontal return tubular boiler, already installed, for the purpose ofincreasing the efficiency of such boiler, to increase the efficiency of its furnace and to reduce or eliminate the presenceof smoke usuallydischarged with the products of'combustion.

It further has for its object to produce a' simplified system in which'the water in the boiler is caused tocirculate, theparts of which system where sediment is liable to collect being capable of inspection and cleansing. V

The following isa description of an embodiment of my invention,

Fig. 1 being a central longitudinal vertical section through the setting of'a boiler to which my system is applied;

Fig. 2 is a horizontal section on the line 22, Fig. 1, the boiler'being shown. in dots and the-connections thereto above the sectional-plane being also shown; T

Fig. 3 is asection of the setting on the line 3-3, Fig. 1', the boiler withits connections and tlie-;blastsystem being shownin elevation; and" Fig, 4 is a vertical section on' theline 4 1,- Fi' 1. l

Tieferring more particularly to the drawings, l is a return tubularboiler of ordinary construction supported by lugs 22 and a setting 3 in the ordinary manner, my system 7 7 being adapted to beapplied to boilers already installed. sis the ordinary grate the rear end of which extends to a bridgewall 5', which, in my construction, is built up so as to leave a throat 6 whose lower. surface preferably conforms substantially to the curvature of the boiler. VVith a boiler 6 feet in diameter and 18 feet long, having 7 0' four inch tubes, with a draft of about fourtenths (.4) of an inch, I make this throat about 63-inchesin width and about 11 inches in height, so as to constrict to some extent theexit passage from the fire-box and re tam the gases therein until they become highly incandescent. The ends of the bridgewall are built up at 77 so as to close the angle between the sides of the boilcrand the setting and these built-up portions 7-7 are provided with outwardly slanting forward faces 8-8, which serve to guide the gases toward the middle ofthe' combustion chamber. At the-rear of the bridgewall I provide an. arch 9 located belowthe boiler and above which is a wall 10 extendingupward to the boiler so as to closethe spaces above this arch and between the sides of the boiler and the setting. 11 is alongitudinally extending pipe, which, with a boiler havingxthe dimensions above referred to is about four inches in diameter. This pipe extends through thefire-box and combustion chamber adjacent to one wall of the setting, passing beneath the arch 9 and through one of the built-up portions? and being connected at the front end of the boiler by a transversely extendinginclinedj pipe 12 and coupling 13to anipple which enters the boiler head. This'nipple I preferably secure in the boiler head by removing a corresponding boiler tube andexpanding the nipple in place. The rear end of the pipe 11 is connected by a transversely extending inclined pipe 12, coupling 13 and nippleto the rear boiler head in a similar manner through the opening left by the removal of the boiler tube above referred to. Therear end ofthe pipe 11 is lower than-thefront end thereof, the drop-being about one and onehalf (19,) inchesperfect. In order to provide easy inspection for thepipe -l1, I'prov'idein the couplingslt, 14 screw plugs 15, 1

15- ,whichcan be removed and when removed permit of 7 easy inspection of I the interior of-the pipe 11 and the easy cleansing of the same. Connected to the coupling la" is a blow-off pipe 16, provided'with a cock 17 so that the boiler and system can be entirely emptied thereby. Connected with the boiler is the ordinaryblow-off pipe 18, provided with its coclr19.

In the invert at the front of'the boiler se ting'I provide an air blast pipe 20 having a plurality of nozzles 21, ten such nozzles being shown in the present instance; The mouths of these nozzles are flattened horizontally and I space them about six inches apart, so that air discharged from said nozzles will form an approximately continuous sheet over the fire in the fire-box. The right-hand end of this pipe is connected with a three inch riser 22, which extends near to the top of the furnace so that air coming in through the blast shall be taken from a heated source. Opening into the top of the riser is a small steam pipe 23, provided with a cock 24, the steam from which pipe, when the cock 2 1 is opened, discharges into the riser 22, drawing in the warm air and cansing it to be discharged, intermingled with the steam, into the front part of the fire-box, as shown in Figs. 1 and 2, the discharge being in a somewhat downward direction toward the upper portion of the bridgewall beneath the throat 6. is a chamber from which leads the connection 26 through which the products of combustion pass to the stack.

The chamber 25 and fire-box and ash pit areprovided with doors 27, 28 and 29 in the ordinary manner. The combustion chamber 30 is constructed so as to slant downwardly from the bridgewall, as shown at 31.

In operating a system such as described, water is introduced in the boiler in the ordinary manner and after the fire has been started in the fire-box the cock 24: is opened to admit steam so as to cause air to be discharged into the fire-box mixed with steam through the nozzles 21. This air mingling with the gases from the fuel assists in their more complete combustion, the partially consumed gases passing through the restricted throat 6 until some of them impinge against the arch 9 and the wall above it, whereupon they are checked somewhat, thorou hly mixed and deflected downwardly away rom the relatively cool boiler and toward the rear portion of the pipe 11, passing outward in the combustion chamber 30, and thence through the tubes of the boiler to the chamber 25 and stack 26. The mingling of the gases with the air in this manner produces substantially complete combustion, by reason of supplying the necessary oxygen for such complete combustion in such a way as to cause a proper commingling with the gases, thus avoiding loss by the escape of unburned gases.- As the water in the pipe 11 becomes heated, a circulation is set up therethrough and through the boiler, the water flowing from the lower part of the pipe 11 to the upper part and thence into the front end of the boiler, returning through the rear end of the boiler. This sets up a circulation through the system and a commotion in the boiler which, through its disturbance, causes the boiler to steam more freely and also tends to remove the scale from the boiler so that the heat from the gases is more readily absorbed by the water 1n the boiler, with the result that the efficiency of-theboiler is largely increased by this circulation, as well as is the eiiiciency of the furnace by the introduction of the ,7

easy removal and convenient cleansing of the pipe 11. The pipe 11 being straight, the re moval of the plugs 15, 15 permits of thorough inspection and cleansing thereof. 7

The combustion which results from the use of the air blast above referred to is such as t approximately'eliminate smoke from the products of combustion discharged through the stack.

The substantially complete combustion of the gases, as above described, together with the greater heat absorption ability of the boiler, because of the circulation, results in a considerable lowering of the'temperature of the flue gases when leaving the boiler.

The presence of but four bends or angles in the circulating system and the absence of pockets, results in a free circulation of the water and reduces the liability ofsediment to collect and the formation of scale in the pipe.

As will .be evident to those, skilled in the art, my invention permits of various modifications without departing from the spirit thereof or the scope of theappended claims.

I What I claim is:

1. In a steam boiler system a horizontal return tubular boiler and setting having a fire box at its forward end provided with a bridge wall and a combustion chamber to.

the rear of said bridge wall, in combination wlth a baffling arch behind said bridge wall anddepending from said boiler, a circulatmg pipe extending the length of said boiler through said fire box and combustion chamher and inclined downwardly toward the rear and connected to the heads of the boiler below the water line, the rear portion of said circulating pipe being exposed' to the gases downwardly deflected by the baffling arch, and rearwardlydischarging blast nozzles at the front of said fire box.

2. In a steam boiler system a horizontal return tubular boiler andsetting having a fire box at its forward end, provided with a bridge wall, and a combustion chamber to the rear of said wall, 1n combination with a bat flected by said bafiiing arch, and rearwardly discharging blast nozzles at the front of said fire box.

3. In a steam boiler system a horizontal 5 return tubular boiler and setting having a 10 pending from said boiler, a circulating pipe extending thelength of said boiler through said fire box and combustion chamber and inclined downwardly toward the rear and connected to the heads of the boiler below the water line, the rear portion of said circulating pipe being exposed to the gases downwardly deflected by said bafifling arch, and rearwardly discharging blast nozzles at the front of said fire box, the circulating pipe being located beneath one side of the boiler and the connections between the ends of said pipe and the boiler heads being also inclined.

JAMES J. MILDON. 

